; NES registers

	.DEF PPU_CTRL_REG1,        $2000
	.DEF PPU_CTRL_REG2,        $2001
	.DEF PPU_STATUS,           $2002
	.DEF PPU_SPR_ADDR,         $2003
	.DEF PPU_SPR_DATA,         $2004
	.DEF PPU_SCROLL_REG,       $2005
	.DEF PPU_ADDRESS,          $2006
	.DEF PPU_DATA,             $2007
	.DEF APU_REG_BASE,         $4000
	.DEF APU_SQUARE1_REG,      $4000
	.DEF APU_SQUARE2_REG,      $4004
	.DEF APU_TRIANGLE_REG,     $4008
	.DEF APU_NOISE_REG,        $400C
	.DEF APU_DELTA_REG,        $4010
	.DEF APU_MASTERCTRL_REG,   $4015
	.DEF PPU_SPR_DMA,          $4014
	.DEF JOYPAD_PORT1,         $4016
	.DEF JOYPAD_PORT2,         $4017
